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Aidala, C. A.; Altaf, S.; Belmont, R.; Boose, S.; Cacace, D.; Connors, M.; Desmond, E.; Frantz, J.; Gamez, E. A.; Grau, N.; Haggerty, J. S.; Hodges, A.; Huang, J.; Kim, Y.; Lenz, M. D.; Lenz, W.; Lewis, N. A.; Mannel, E. J.; Osborn, J. D.; Perepelitsa, D. V.; Phipps, M.; Pisani, R.; Polizzo, S.; Pun, A.; Purschke, M. L.; Riedl, C.; Rinn, T.; Romero Hernandez, A. C.; Sarsour, M.; Shi, Z.; Sickles, A. M.; Smith, C.; Stoll, S.; Sun, X.; Thorsland, E.; Vassalli, F.; Wang, X.; Woody, C. L.
IEEE transactions on nuclear science, 02/2021, Letnik: 68, Številka: 2Journal Article
sPHENIX is a new experiment under construction for the Relativistic Heavy Ion Collider at Brookhaven National Laboratory which will study the quark-gluon plasma to further the understanding of quantum chromodynamics (QCP) matter and interactions. A prototype of the sPHENIX electromagnetic calorimeter (EMCal) was tested at the Fermilab Test Beam Facility in Spring 2018 as experiment T-1044. The EMCal prototype corresponds to a solid angle of <inline-formula> <tex-math notation="LaTeX">\Delta \eta \times \Delta \phi = 0.2 \times 0.2 </tex-math></inline-formula> centered at pseudo-rapidity <inline-formula> <tex-math notation="LaTeX">\eta = 1 </tex-math></inline-formula>. The prototype consists of scintillating fibers embedded in a mix of tungsten powder and epoxy. The fibers project back approximately to the center of the sPHENIX detector, giving 2-D projectivity. The energy response of the EMCal prototype was studied as a function of position and input energy. The energy resolution of the EMCal prototype was obtained after applying a position-dependent energy correction and a beam profile correction. Two separate position-dependent corrections were considered. The EMCal energy resolution was found to be <inline-formula> <tex-math notation="LaTeX">\sigma (E)/\langle E\rangle = 3.5(0.1) \oplus 13.3(0.2)/\sqrt {E} </tex-math></inline-formula> based on the hodoscope position-dependent correction, and <inline-formula> <tex-math notation="LaTeX">\sigma (E)/\langle E\rangle = 3.0(0.1) \oplus 15.4(0.3)/\sqrt {E} </tex-math></inline-formula> based on the cluster position-dependent correction. These energy resolution results meet the requirements of the sPHENIX physics program.
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